Receivables [Abstract] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Consumer Portfolio Segment [Member] Consumer Portfolio Segment [Member] Commercial Portfolio Segment [Member] Commercial Portfolio Segment [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Residential Mortgage [Member] Residential Mortgage [Member] Home Equity Line of Credit [Member] Home Equity Line of Credit [Member] Commercial Business [Member] Commercial Loan [Member] Financing Receivable, Modification, Type of Concession [Axis] Financing Receivable, Modification, Type of Concession [Axis] Describes the type of concession given by the entity to debtor. Financing Receivable, Concessions [Domain] Financing Receivable, Concessions [Domain] Concessions given to a borrower under a loan modification. Interest Rate Reduction [Member] Interest Rate Reduction [Member] Interest rate reduction. Payment Restructure [Member] Payment Restructure [Member] Payment restructure. Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Number of loan modifications - TDR Financing Receivable, Modifications, Number of Contracts Recorded investment - TDR Financing Receivable, Modifications, Recorded Investment at Period End Financing Receivable, Modifications, Recorded Investment at Period End Related charge-offs - TDR Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations [Member] Municipal Bonds [Member] Municipal Bonds [Member] Residential [Member] Collateralized Residential Mortgage Obligations [Member] The category includes multiclass, pay-through securitizations collateralized by residential mortgages secured by assets, such as automobiles and boats, which are generally structured so that the collections of principal and interest due from the underlying debtors are paid to the holders of the CMO. Commercial [Member] Collateralized Commercial Mortgage Obligations [Member] The category includes multiclass, pay-through securitizations collateralized by commercial mortgages secured by assets, such as automobiles and boats, which are generally structured so that the collections of principal and interest due from the underlying debtors are paid to the holders of the CMO. Corporate Debt Securities [Member] Corporate Debt Securities [Member] US Treasury Securities [Member] US Treasury Securities [Member] Agency Securities [Member] Agency Securities [Member] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] [Line Items] for Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Available-for-sale Debt Securities: Mortgage Backed and Collateral Mortgage Obligation [Abstract] Mortgage backed and collateral mortgage obligation. Amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Gross unrealized gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross unrealized losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair value Available-for-sale Securities Held-to-maturity Securities Held-to-maturity Securities [Abstract] Amortized cost Held-to-maturity Securities Gross unrealized gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross unrealized losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair value Held-to-maturity Securities, Fair Value Commercial Real Estate Portfolio Segment [Member] Commercial Real Estate Portfolio Segment [Member] Non-Owner Occupied Commercial Real Estate [Member] None Owner Occupied Commercial Real Estate [Member] None Owner Occupied Commercial Real Estate [Member] Multifamily [Member] Multifamily Residential [Member] Residential multifamily property. Construction/land development [Member] Construction Loans [Member] Owner Occupied Commercial Real Estate [Member] Owner Occupied Commercial Real Estate [Member] Owner Occupied Commercial Real Estate [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Beginning Balance Financing Receivable, Allowance for Credit Losses Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Provision for credit losses Provision for Loan, Lease, and Other Losses Ending Balance Accounting Policies [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Secured Line of Credit [Member] Secured Line of Credit [Member] Secured Line of Credit [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Windermere Mortgage Services Series LLC [Member] Windermere Mortgage Services Series LLC [Member] Windermere Mortgage Services Series LLC [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Number of individual operating series entity is subdivided into Equity Method Investment, Number of Operating Series Equity Method Investment, Number of Operating Series Income from equity method investments Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Equity method investment in WMS Equity Method Investments Contracted service income (loss) Sales Revenue, Services, Net Purchase of single family mortgage loans from WMS Purchase of single family mortgage loans from WMS Purchase of single family mortgage loans from WMS Commitments and contingencies Other Commitment Outstanding balance of secured line of credit Loans Receivable, Net Highest balance of loans to borrower Highest balance of loans to borrower Highest balance of loans to borrower Earnings Per Share [Abstract] EARNINGS PER SHARE Earnings Per Share [Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Simplicity bank [Member] Simplicity bank [Member] Simplicity bank [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Cash paid (79,399 stock options, consideration based on intrinsic value at a calculated price of $17.53) Payments to Acquire Businesses, Gross Fair value of common shares issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Total purchase price Business Combination, Consideration Transferred Fair value of assets acquired: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Investment securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Acquired loans Business Combination, Acquired Receivables, Fair Value Mortgage servicing rights Business Combination, Servicing Asset Business Combination, Servicing Asset Federal Home Loan Bank stock Business Combination, Purchase Price Allocation, FHLB Stock Business Combination, Purchase Price Allocation, FHLB Stock Premises and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Bank-owned life insurance Business Combination, Purchase Price Allocation, Bank Owned Life Insurance Business Combination, Purchase Price Allocation, Bank Owned Life Insurance Core deposit intangibles Business Combination, Purchase Price Allocation, Amortizable Intangible Assets Business Combination, Purchase Price Allocation Amortizable Intangible Assets Accounts receivable and other assets Business Combination, Purchase Price Allocation, Other Assets Amount of acquisition cost of a business combination allocated to other assets not separately disclosed in the balance sheet. Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Fair value of liabilities assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Federal Home Loan Bank advances Business Combination, Purchase Price Allocation, FHLB Advances Business Combination, Purchase Price Allocation, FHLB Advances Accounts payable and accrued expenses Business Combination, Purchase Price Allocation, Accrued Liabilities The amount of acquisition cost of a business combination allocated to accrued expenses of the acquired entity. Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Bargain purchase (gain) Business Combination, Bargain Purchase, Gain Recognized, Amount Number of options paid in a business acquisition Business Acquisition, Number of Options Paid Business Acquisition, Number of Options Paid Acquisition share price (in dollars per share) Business Acquisition, Share Price Number of shares of equity interest acquired Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Schedule of Goodwill Schedule of Goodwill [Table Text Block] Mortgage Banking [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Representations and Warranties Reserve for Loan Receivables [Member] Representations and Warranties Reserve for Loan Receivables [Member] A reserve for expected or probable losses from the repurchase of loan receivables related to certain representations and warranties made at the time the loan was sold. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Balance, beginning of period Loss Contingency Accrual Additions, net of adjustments Loss Contingency Accrual, Provision Realized losses Loss Contingency Accrual, Payments Balance, end of period Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Loan origination and sale activities [Member] Loans [Member] Loan servicing income (loss) [Member] Servicing Contracts [Member] Other [Member] Other Credit Derivatives [Member] Mortgages [Member] Mortgages [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Net gain (loss) recognized on derivatives, including economic hedge Derivative, Gain (Loss) on Derivative, Net Quarterly Financial Information Disclosure [Abstract] Unaudited Quarterly Financial Data Quarterly Financial Information [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Credit Risk, Master Netting Arrangements [Member] Fair Value, Concentration of Credit Risk, Master Netting Arrangements [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Forward Contracts [Member] Forward Contracts [Member] Interest Rate Swaption [Member] Interest Rate Swaption [Member] Interest Rate Lock Commitments [Member] Interest Rate Lock Commitments [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Eurodollar Future [Member] Eurodollar Future [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Notional Amount Derivative, Notional Amount Derivatives before netting, Derivative assets Derivative Asset, Fair Value, Gross Asset Netting adjustments, Derivative Assets Derivative Asset Fair Value Amount Offset Against Other Derivatives The amount as of the balance sheet date of the fair value of derivative assets that in accordance with the entity's accounting policy was offset against other derivative contracts under a master netting arrangement. Derivative Assets Derivative Asset Derivatives before netting, Derivative Liability Derivative Liability, Fair Value, Gross Liability Netting adjustments, Derivative Liabilities Derivative Liability Fair Value Amount Offset Against Other Derivatives The amount as of the balance sheet date of the fair value of derivative liabilities that in accordance with the entity's accounting policy were offset against other derivative contracts under a master netting arrangement. Derivative Liabilities Derivative Liability Cash collateral Right to reclaim cash in excess of fair value of derivative liability The right to reclaim cash that is in excess of fair value of derivative liability. Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Cash and cash equivalents (including interest-earning instruments of $30,268 and $34,615) Cash and Cash Equivalents, at Carrying Value Investment securities (includes $846,268 and $993,990 carried at fair value) Marketable Securities Loans held for sale (includes $577,313 and $656,334 carried at fair value) Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans held for investment (net of allowance for loan losses of $37,847 and $34,001; includes $5,477 and $17,988 carried at fair value) Loans and Leases Receivable, Net Amount Mortgage servicing rights (includes $258,560 and $226,113 carried at fair value) Servicing Asset Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Federal Home Loan Bank stock, at cost Federal Home Loan Bank Stock Premises and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other assets Other Assets Total assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Deposits Deposits Federal Home Loan Bank advances Advances from Federal Home Loan Banks Accounts payable and other liabilities Accounts Payable and Accrued Liabilities Long-term debt Long-term Debt Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, no par value, authorized 10,000 shares, issued and outstanding, 0 shares and 0 shares Preferred Stock, Value, Issued Common stock, no par value, authorized 160,000,000 shares, issued and outstanding, 26,888,288 shares and 26,800,183 shares Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Residential Mortgage [Member] Available-for-sale Securities Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 months, Gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Less than 12 months, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12 months or more, Fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Held-to-maturity Securities Less than 12 months, Gross unrealized losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Gross unrealized losses Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total gross unrealized losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss Less than 12 months, Fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 12 months or more, Fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total Fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value Commitments and Contingencies Disclosure [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2023 and thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum payments Operating Leases, Future Minimum Payments Due Banking and Thrift [Abstract] Interest expense on deposits Interest Expense, Deposits [Abstract] NOW accounts Interest Expense, Negotiable Order of Withdrawal (NOW) Deposits Statement savings accounts Interest Expense, Savings Deposits Money market accounts Interest Expense, Money Market Deposits Certificates of deposit Interest Expense, Time Deposits Interest expense on deposits, Total Interest Expense, Deposits Statement of Comprehensive Income [Abstract] Tax (benefit) expense on unrealized holding gain on securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Tax (benefit) expense on reclassification adjustment for net gain on securities included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Regulatory Capital Requirements [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Property, Plant and Equipment [Abstract] Furniture and equipment Furniture and Fixtures, Gross Leasehold improvements Leasehold Improvements, Gross Land and buildings Buildings and Improvements, Gross Property, plant and equipment, Gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment, Net Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Residential Real Estate [Member] Residential Real Estate [Member] Commercial Real Estate [Member] Commercial Real Estate [Member] Construction Loans [Member] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Real Estate, Gross SEC Schedule III, Real Estate, Gross Valuation allowance Real Estate Owned, Valuation Allowance, Net of Portion Attributable to FHA Real Estate Owned, Valuation Allowance, Net of Portion Attributable to FHA Total other real estate owned Real Estate Acquired Through Foreclosure Schedule of Minimum Rental Payment Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Loans and Leases Receivable, Related Parties [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Beginning balance Loans and Leases Receivable, Related Parties Principal repayments and advances, net Loans and Leases Receivable, Related Parties, Proceeds Ending balance Fair Value Disclosures [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Weighted Average [Member] Weighted Average [Member] Financial Instrument [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Interest rate lock and purchase loan commitments, net Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Fair value inputs, fall out factor Fair Value Inputs, Fall Out Factor Percentage of interest rate lock commitment contractuals not expected to reach funding. Fair value inputs, initial value of servicing Fair Value Inputs, Initial Value of Servicing The initial value of the servicing rights embedded in an interest rate lock commitment. Components of Deferred Tax Assets [Abstract] Provision for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Federal and state net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Other real estate owned Deferred Tax Assets, Other Real Estate Owned Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other real estate owned. Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Other investments Deferred Tax Assets, Investments Leases Deferred Tax Assets, Property, Plant and Equipment Unrealized loss on investment available for sale securities Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Tax credits Deferred Tax Assets, Tax Credit Carryforwards Stock-based compensation Deferred Tax Assets, Stock Options Deferred Tax Assets, Stock Options Loan valuation Deferred Tax Assets, Loan Valuation Deferred Tax Assets, Loan Valuation Other, net Deferred Tax Assets, Other Deferred tax assets, gross Deferred Tax Assets, Gross Components of Deferred Tax Liabilities [Abstract] Mortgage servicing rights Deferred Tax Liabilities, Mortgage Servicing Rights Federal Home Loan Bank Dividends Deferred Tax Liabilities, Federal Home Loan Bank Dividends Amount before allocation of valuation allowances of deferred tax liabilities attributable to deductible temporary differences from Federal Home Loan Bank dividends. Deferred loan fees and costs Deferred Tax Liabilities, Deferred Loan Fees and Costs Amount of deferred tax liabilities attributable to taxable temporary differences from deferred loan fees and costs. Premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Intangibles Deferred Tax Liabilities, Intangible Assets Other, net Deferred Tax Liabilities, Other Deferred tax liability, gross Deferred Tax Liabilities, Gross Net deferred tax liability Deferred Tax Liabilities, Net Fair Value Inputs, Assets, Quantitative Information [Table] Fair Value Inputs, Assets, Quantitative Information [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Loans held for investment [Member] Loans held for investment [Member] Loans held for investment [Member] Loans held for sale [Member] Loans held for sale [Member] Loans held for sale [Member] Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair value of loans held for investment Loans Receivable, Fair Value Disclosure Loans held-for-sale Loans Held-for-sale, Fair Value Disclosure Implied spread Fair Value Inputs, Implied Spread Fair Value Inputs, Implied Spread Market price movement from comparable bond Fair Value Inputs, Comparability Adjustments Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Stockholders' Equity Attributable to Parent [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Beginning balance, shares Common Stock, Shares, Outstanding Net income Net Income (Loss) Attributable to Parent Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Common stock issued Stock Issued During Period, Value, New Issues Common stock issued, shares Stock Issued During Period, Shares, New Issues Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Ending balance Ending balance, shares Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Investment Securities Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Federal Home Loan Bank Stock Federal Home Loan Bank Stock [Policy Text Block] Federal Home Loan Bank Stock [Policy Text Block] Loans Held for Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Loans Held for Investment Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Nonaccrual Loans Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy [Policy Text Block] Impaired Loans Impaired Financing Receivable, Policy [Policy Text Block] Troubled Debt Restructurings Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block] Allowance for Credit Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Other Real Estate Owned Real Estate Owned, Valuation Allowance, Policy [Policy Text Block] Mortgage Servicing Rights Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block] Investment in WMS Series LLC Equity Method Investments, Policy [Policy Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Trust Preferred Securities Debt, Policy [Policy Text Block] Federal Funds Purchased and Securities Sold Under Agreements to Repurchase Repurchase and Resale Agreements Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Derivatives and Hedging Activities Derivatives, Policy [Policy Text Block] Share-Based Employee Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Commitments, Guarantees, and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Business Segments Segment Reporting, Policy [Policy Text Block] Advertising Expense Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Recent Accounting Developments New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Federal Home Loan Bank Advance by Maturity Federal Home Loan Bank Advance by Maturity [Table Text Block] Schedule of Federal Home Loan Bank Advance by year of maturity. Real Estate Owned, Valuation Allowance [Roll Forward] Real Estate Owned Valuation Allowance [Roll Forward] Beginning balance Real Estate Owned, Valuation Allowance Loss provisions Real Estate Owned, Valuation Allowance, Provision (Charge-offs), net of recoveries Real Estate Owned, Valuation Allowance, Amounts Applied Ending balance COMMITMENTS, GUARANTEES, AND CONTINGENCIES Commitments Contingencies and Guarantees [Text Block] Business Combinations Business Combination Disclosure [Text Block] Equity [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassification Out of Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Effective Income Tax Rate Reconciliation, Amount [Abstract] Income tax at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income tax expense net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Tax-exempt interest Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Amortization of and pass-through losses from low income housing investments Low income housing tax credit partnerships Low income housing tax credit partnerships - income from LIHTC Change in state tax rate Change in state tax rate Change in state tax rate - income tax expense from a change in the state rate Bargain purchase gain Effective Income Tax Rate Reconciliation, Bargain Purchase Gain, Amount Effective Income Tax Rate Reconciliation, Bargain Purchase Gain, Amount Reversal of deferred tax consequences on historical AFS Effective Income Tax Rate Reconciliation, Deduction, Amount Impact from Federal Rate Change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Uncertain tax positions Effective Income Tax Reconciliation, Uncertain Tax Positions, Amount Effective Income Tax Reconciliation, Uncertain Tax Positions, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax (benefit) expense Income Tax Expense (Benefit) Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Accrual Financing Receivable Recorded Investment Performing Financing receivable that is considered to be performing and are still accruing interest. Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Loans and Leases Receivable before Fees, Gross Loans and Leases Receivable before Fees, Gross Investment commitment [Member] Investment Commitment [Member] Investment Commitment [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Undisbursed construction loan funds [Member] Undisbursed construction loan funds [Member] Undisbursed construction loan funds Home Equity and Business Banking Credit Lines [Member] Home Equity and Business Banking Credit Lines [Member] Home Equity and Business Banking Credit Lines Loss Sharing Relationship [Member] Loss Sharing Relationship [Member] A loss sharing relationship that is accounted for as a guarantee under U.S. GAAP. Credit Risk [Member] Credit Risk [Member] Unfunded loan commitments Credit of Unfunded Commitments Credit of unfunded commitments. Unfunded commitment balance of loans sold on a servicing-retained basis Guarantor Obligations, Maximum Exposure, Undiscounted Allowance for unfunded commitments Allowance for unfunded commitments Allowance for unfunded commitments. Investment in qualifying small businesses Rental expense Operating Leases, Rent Expense, Net Percentage of Loss that Lender is Responsible For on Loans Sold under Loss Sharing Agreement Percentage of Loss that Lender is Responsible For on Loans Sold under Loss Sharing Agreement Percentage of Loss that Lender is Responsible For on Loans Sold under Loss Sharing Agreement UPB of loans sold through DUS Loans sold through DUS Unpaid principal of Loans sold through DUS program. Reserve liability related to multifamily DUS Program Reserve liability related to multifamily DUS Program Reserve liability related to multifamily DUS Program Loss incurred - related to DUS Loss Contingency, Loss in Period Reserve liability related to mortgage repurchase Number of material claims pending Loss Contingency, Pending Claims, Number Other Real Estate [Roll Forward] Other Real Estate [Roll Forward] Beginning balance Additions SEC Schedule III, Real Estate, Acquisitions Through Foreclosures Loss provisions Reductions related to sales SEC Schedule III, Real Estate, Cost of Real Estate Sold Ending balance Mortgage Loans on Real Estate Schedule [Table] Mortgage Loans on Real Estate Schedule [Table] Single Family other [Member] Single Family Residential Mortgage Loans, Excluding U.S. Government Agency Mortgage Backed Securities [Member] Single family residential mortgage loans, excluding loans held in U.S. Government Agency mortgage pools. Single Family Residential [Member] Single Family Residential [Member] Single family residential. Multifamily DUS [Member] Multifamily DUS [Member] Multifamily DUS - commercial mortgage. Other [Member] Commercial Mortgage, excluding DUS [Member] Multifamily/commercial Mortgage, excluding DUS. Loans serviced for others Loans Serviced for Others [Abstract] Loans serviced for others. Loans serviced for others Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding Income Statement [Abstract] Interest income: Interest and Dividend Income, Operating [Abstract] Loans Interest and Fee Income, Loans and Leases Investment securities Interest and Dividend Income, Securities, Operating, Available-for-sale Other Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Deposits Federal Home Loan Bank advances Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Short-term Federal funds purchased and securities sold under agreements to repurchase Interest Expense, Securities Sold under Agreements to Repurchase Long-term debt Interest Expense, Long-term Debt Other Interest Expense, Other Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for credit losses Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Noninterest income: Noninterest Income [Abstract] Net gain on loan origination and sale activities Net Gains Losses on Mortgage Loan Origination and Sales Activities Net gain on mortgage loan origination and sale activities. Loan servicing income Bank Servicing Fees Income from WMS Series LLC Income (Loss) from Equity Method Investments Depositor and other retail banking fees Depositor and Other Retail Banking Fees Depositor and other retail banking fees. Insurance agency commissions Insurance Commissions and Fees Gain on sale of investment securities available for sale Available-for-sale Securities, Gross Realized Gain (Loss) Bargain purchase gain Other Noninterest Income (Expense), Other Noninterest Income (Expense), Other Total noninterest income Noninterest Income Noninterest expense: Noninterest Expense [Abstract] Salaries and related costs Labor and Related Expense General and administrative General and Administrative Expense Amortization of core deposit intangibles Amortization of Intangible Assets Legal Legal Fees Consulting Professional Fees Federal Deposit Insurance Corporation assessments Federal Deposit Insurance Corporation Premium Expense Occupancy Occupancy, Net Information services Communications and Information Technology Net (benefit) cost from operation and sale of other real estate owned Net cost (income) from operations and sale of other real estate owned Amount of net cost (income) from operations and sale of other real estate owned during the period. Total noninterest expense Noninterest Expense Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax (benefit) expense NET INCOME Basic income per share (in dollars per share) Earnings Per Share, Basic Diluted income per share (in dollars per share) Earnings Per Share, Diluted Basic weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Basic Diluted weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Diluted Segment Reporting [Abstract] BUSINESS SEGMENTS Segment Reporting Disclosure [Text Block] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Parent Company Financial Statements Condensed Financial Information of Parent Company Only Disclosure [Text Block] Projected Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2023 and thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Carrying value of multifamily MSR Servicing Asset at Amortized Cost Other comprehensive loss, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized (loss) gain on investment securities available for sale: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Unrealized holding gain (loss) arising during the year, net of tax expense (benefit) of $1,942, $(3,400) and $(713) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification adjustment for net gains included in net income, net of tax expense (benefit) of $172, $889 and $(264) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other comprehensive income (loss) Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Loans held for investment Accounts, Notes, Loans and Financing Receivable, Classified [Abstract] Loans held for investment before deferred fees, costs and allowance Net deferred loan fees and costs Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Loans held for investment, net of deferred loan fees and costs Loans and Leases Receivable, Net of Deferred Income Allowance for losses on loans held for investment Loans and Leases Receivable, Allowance Loans held for investment Schedule of Loans Held for Sale and Sold Mortgage Loans on Real Estate, by Loan Disclosure [Table Text Block] Tabular disclosure of mortgage loans on Real Estate, held for sale and sold. Net Gain on Mortgage Loan Origination and Sale Activity Net Gain on Mortgage Loan Origination and Sale Activity [Table Text Block] Net gain on mortgage loan origination and sale activity. Company's Portfolio of Loans Serviced for Others Portfolio of Loans Serviced for Others [Table Text Block] Company's portfolio of loans serviced for others. Schedule of Mortgage Repurchase Losses Mortgage Repurchase Losses [Table Text Block] Mortgage Repurchase Losses rollforward Revenue from Mortgage Servicing, Including the Effects of Derivative Risk Management Instruments Schedule of Revenue from Mortgage Servicing Including Effects of Derivative Risk Management Instruments [Table Text Block] Revenue from mortgage servicing, including the effects of derivative risk management instruments. Key Economic Assumptions Used in Measuring Initial FV of Capitalized Single Family MSRs Key Economic Assumptions Used in Measuring Initial Value of Capitalized Single Family Created from Loan Sales with Retained Servicing [Table Text Block] Key economic assumptions used in measuring the initial value of capitalized single family MSRs created from loan sales with retained servicing. Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Changes in Single Family MSRs Measured at Fair Value Schedule of Servicing Assets at Fair Value [Table Text Block] Changes in Multifamily MSRs Measured at the Lower of Amortized Cost or Fair Value Servicing Asset at Amortized Cost [Table Text Block] Projected Amortization Expense for the Gross Carrying Value of Multifamily MSRs Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Single family [Member] SBA [Member] SBA [Member] SBA [Member] CRE Non-DUS [Member] Mortgage Loans on Real Estate [Line Items] Mortgage Loans on Real Estate [Line Items] Loans sold Mortgage Loans on Real Estate, Cost of Mortgages Sold Loans transferred from held for sale to held for investment Transfer of Loans Held-for-sale to Portfolio Loans Servicing Contracts [Member] Servicing fees and other Servicing Fees and Other Servicing fees and other. Changes in fair value of single family MSRs due to modeled amortization Changes in Fair Value of Mortgage Servicing Rights Due to Modeled Amortization Changes in the fair value of mortgage servicing rights due to modeled amortization. Amortization of multifamily and SBA MSRs Amortization of Mortgage Servicing Rights (MSRs) Net Servicing Income Net Servicing Income Servicing and other related fees, net of payments. Changes in fair value of MSRs due to changes in market inputs and/or model updates Servicing Asset at Fair Value, Other Changes in Fair Value Net gain (loss) from derivatives economically hedging MSR Mortgage servicing rights, risk management Mortgage servicing rights, risk management Changes in MSR fair value due to changes in model inputs and assumptions, net of risk management derivatives. Loan servicing income DERIVATIVES AND HEDGING ACTIVITIES Derivative Instruments and Hedging Activities Disclosure [Text Block] Interest income Interest expense Noninterest income Noninterest expense Basic earnings per share (in dollars per share) Diluted earnings per share (in dollars per share) Securities pledged to secure borrowings from Federal Home Loan Bank Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank Securities pledged to Washington and California State to secure public deposits Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments. Securities pledged to secure derivatives in a liability position Pledged Financial Instruments, Securities pledged to secure derivatives in a liability position Pledged Financial Instruments, Securities pledged to secure derivatives in a liability position Other securities pledged Pledged Assets Separately Reported Other Securities Pledged Pledged Assets Separately Reported Other Securities Pledged Total securities pledged as collateral Pledged Financial Instruments, Not Separately Reported, Securities Rates per annum [Abstract] Rates Per Annum [Abstract] Rates per annum. Constant prepayment rate (CPR) Fair Value Inputs, Prepayment Rate Discount rate Fair Value Inputs, Discount Rate Federal Home Loan Bank, Advances [Table] Federal Home Loan Bank, Advances [Table] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank of Des Moines [Member] Federal Home Loan Bank of Des Moines [Member] Federal Reserve Bank of San Francisco [Member] Federal Reserve Bank of San Francisco [Member] Federal reserve bank of San Francisco [Member] Federal Home Loan Bank and Other Borrowings [Line Items] Federal Home Loan Bank, Advances [Line Items] Advances from Federal Home Loan Banks Weighted-average interest rates on the advances Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End Available line of credit with the FHLB as a percentage of assets Federal Home Loan Bank, Available Line of Credit, Percentage of Assets Federal Home Loan Bank, Available Line of Credit, Percentage of Assets Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Federal Home Loan Bank Stock FHLB stock impairment FHLB stock impairment OTTI impairment of FHLB stock investment Line of credit facility, amount outstanding from FRBSF Long-term Line of Credit Federal funds purchased and securities sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Schedule of Financial Information by Operating Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] MORTGAGE BANKING OPERATIONS Mortgage Banking Operations [Text Block] Mortgage banking operation. Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Doubtful [Member] Doubtful [Member] Unlikely to be Collected Financing Receivable [Member] Unlikely to be Collected Financing Receivable [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] WASHINGTON WASHINGTON CALIFORNIA CALIFORNIA Class of Financing Receivable [Domain] Federal Home Loan Bank Advances [Member] Federal Home Loan Bank Advances [Member] Federal Reserve Bank Advances [Member] Federal Reserve Bank Advances [Member] Number of operating segments Number of Operating Segments Loans Pledged as Collateral Loans Pledged as Collateral Concentration percentage Percentage of Portfolio by State and Property Type for Loan Classes Percentage of portfolio by state and property type for the loan classes. Percentage of Loan Portfolio Percentage of Loan Portfolio Percentage of total loan portfolio. Total loans receivable before fees and costs Total loans held for investment Loans and Leases Receivable, Gross Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Average recorded investment Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net Net fair value adjustment and gain on sale of loans held for sale Increase (Decrease) in Loans Held-for-sale Fair value adjustment of loans held for investment Gains Losses on Loans Held for Investment Gains losses on loans held for investment. Origination of mortgage servicing rights Increase (Decrease) in Mortgage Servicing Rights Increase (Decrease) in Mortgage Servicing Rights Change in fair value of mortgage servicing rights Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Net gain on sale of investment securities Net gain on sale of loans originated as held for investment Gain (Loss) on Sale of Loans and Leases Net fair value adjustment, gain on sale and provision for losses on other real estate owned Net fair value adjustment, gain (loss) and provision on Other Real Estate Owned Net fair value adjustment, gain (loss) and provision on Other Real Estate Owned Loss on disposal of fixed assets Gain (Loss) on Disposition of Assets Loss on lease abandonment Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Net deferred income tax (benefit) expense Increase (Decrease) in Deferred Income Taxes Share-based compensation expense Share-based Compensation Bargain purchase gain Origination of loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Proceeds from sale of loans originated as held for sale Proceeds from Sale of Loans Held-for-sale Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Decrease (increase) in accounts receivable and other assets Increase (decrease) in accounts receivable and other assets Increase or decrease in accounts receivable and other assets. (Decrease) increase in accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Other Liabilities Increase (decrease) in accounts payable and other liabilities. Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of investment securities Payments to Acquire Investments Proceeds from sale of investment securities Proceeds from Sale of Available-for-sale Securities Principal repayments and maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from sale of other real estate owned Proceeds from Sale of Other Real Estate Proceeds from sale of loans originated as held for investment Proceeds from Sale of Loans Held-for-investment Proceeds from sale of mortgage servicing rights Proceeds from Sale of Mortgage Servicing Rights (MSR) Mortgage servicing rights purchased from others Payments to Acquire Mortgage Servicing Rights (MSR) Capital expenditures related to other real estate owned Capital Expenditures Related to Other Real Estate Owned Capital expenditures related to other real estate owned. Origination of loans held for investment and principal repayments, net Payments for (Proceeds from) Loans and Leases Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash acquired from acquisitions Cash Acquired in Excess of Payments to Acquire Business Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Increase in deposits, net Increase (Decrease) in Deposits Proceeds from Federal Home Loan Bank advances Proceeds from Federal Home Loan Bank Borrowings Repayment of Federal Home Loan Bank advances Payments for Federal Home Loan Bank Advances Proceeds from federal funds purchased and securities sold under agreements to repurchase Proceeds from Federal Funds Purchased and Securities Sold under Agreements to Repurchase Proceeds from Federal Funds Purchased and Securities Sold under Agreements to Repurchase Repayment of federal funds purchased and securities sold under agreements to repurchase Payments for Securities Sold under Agreements to Repurchase The cash outflow from investments sold under the agreement to repurchase such investment. Proceeds from Federal Home Loan Bank stock repurchase Payments for (Proceeds from) Federal Home Loan Bank Stock Purchase of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Proceeds from debt issuance, net Proceeds from Issuance of Long-term Debt (Payments) proceeds from equity raise, net Proceeds from (Repurchase of) Equity Proceeds from stock issuance, net Proceeds from Issuance of Common Stock Excess tax benefit related to the exercise of stock options Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities NET INCREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS: Cash and Cash Equivalents, at Carrying Value [Abstract] Beginning of year End of period SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Cash Paid During Year for [Abstract] Cash paid during the period for. Interest paid Interest Paid Federal and state income taxes (refunded) paid , net Income Taxes Paid, Net Non-cash activities: Noncash Investing Activities [Abstract] Noncash investing activities. Loans held for investment foreclosed and transferred to other real estate owned Loans Held for Investment Foreclosed and Transferred to Other Real Estate Owned Loans held for investment foreclosed and transferred to other real estate owned. Loans transferred from held for investment to held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Ginnie Mae loans recognized with the right to repurchase, net Loans Recognized with Right to Repurchase GNMA loans recognized with the right to repurchase, net. OCBB [Member] OCBB [Member] Orange County Business Bank acquisition Assets acquired, excluding cash acquired Business Combinations, Recognized Identifiable Business Combinations, Recognized Identifiable Liabilities assumed Bargain purchase gain Business Combination, Simplicity Bargain Purchase, Gain Recognized, Amount Business Combination, Bargain Purchase, Gain Recognized, Amount Goodwill Goodwill from acquisition Goodwill from acquisition Common stock issued Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying value [Member] Reported Value Measurement [Member] Fair value [Member] Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investment securities held to maturity Single family loans held for investment Loans held for sale - transferred from held for investment Portfolio loans transferred to held for sale, fair value disclosure Portfolio loans transferred to held for sale, fair value disclosure Loans held for sale – multifamily and other Mortgage servicing rights – multifamily Federal Home Loan Bank stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposits Deposits, Fair Value Disclosure Federal Home Loan Bank advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Long-term debt Debt Instrument, Fair Value Disclosure Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock [Member] Restricted Stock [Member] Performance Shares [Member] Performance Shares [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation cost Allocated Share-based Compensation Expense Maximum number of shares of common stock available for grant under the 2014 EIP Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Cash received and related income tax benefits Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Unrecognized compensation costs related to stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Number of stock options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Unrecognized compensation cost related to nonvested restricted shares Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Weighted-average service period remaining for unrecognized compensation costs expected to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Exceed percentage of grant date fair value, one hmst_PercentageOfSharePriceExceedsGrantDateFairValueInConditionOne Percentage of share price exceeds grant date fair value in condition one. Exceed percentage of grant date fair value, two hmst_PercentageOfSharePriceExceedsGrantDateFairValueInConditionTwo Percentage of share price exceeds grant date fair value in condition two. Exceed percentage of grant date fair value, three hmst_PercentageOfSharePriceExceedsGrantDateFairValueInConditionThree Percentage of share price exceeds grant date fair value in condition three. Share-based compensation vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based compensation recognized over requisite period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Opus Bank [Member] Opus Bank [Member] Opus Bank [Member] Boston Private Bank and Trust [Member] Boston Private Bank and Trust [Member] Boston Private Bank and Trust [Member] Bank of Oswego [Member] Bank of Oswego [Member] Bank of Oswego [Member] Number of branches opened Number of Branches Opened Number of Branches Opened Goodwill from acquisition Purchase price of acquisition Number of equity interest issued and issuable per shares acquired Business Acquisition, Equity Interests Issued or Issuable per Share Acquired Business Acquisition, Equity Interests Issued or Issuable per Share Acquired. Par value of common stock (in dollars per share) Common Stock, Par or Stated Value Per Share Cash paid Acquired loans - estimated fair value Discount on acquired loans Business Combination Discount on Acquired Loans Business Combination Discount on Acquired Loans Premium of deposits from business combination Business Combination, Deposit Premium Business Combination, Deposit Premium FHLB advances premium in a business combination Business Combination, FHLB Advances Premium Business Combination, FHLB Advances Premium Computation of Weighted Average Yield Using Coupon on Fair Value Computation of Weighted Average Yield Using Coupon on Fair Value [Abstract] Computation of weighted average yield using coupon on fair value. Available-for-sale Securities Available-for-sale Securities [Abstract] Due within one year or less, Fair value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due after one year through five years, Fair value Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due after five years through ten years, Fair value Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years, Fair value Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Fair value Available-for-sale Securities, Debt Securities Due in one year or less, Weighted Average Yield Available for Sale Securities Debt Maturities within One Year Weighted Average Yield Available for sale securities debt maturities with in one year weighted average yield. Due after one year through five years, Weighted Average Yield Available for Sale Securities Debt Maturities After One Through Five Years Weighted Average Yield Available-for-sale securities debt maturities year two through five fair value Due after five years through ten years, Weighted Average Yield Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Average Yield Available for sale securities debt maturities after five through ten years weighted average yield. Due after ten years, Weighted Average Yield Available for Sale Securities Debt Maturities After Ten Years Weighted Average Yield Available for sale securities debt maturities after ten years weighted average yield. Weighted average yield Available for Sale Securities Debt Maturities Without Single Maturity Date Weighted Average Yield Available for sale securities debt maturities without single maturity date weighted average yield. Due within one year or less, Fair value Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Due after one year through five years, Fair value Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value Due after five years through ten years, Fair value Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Due after ten years, Fair value Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Fair Value Fair Value Due in one year or less, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldWithinOneYear This item represents the average yield on debt securities with maturities within one year of the balance sheet date and which are categorized as held-to-maturity. Due after one year through five years, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldAfterOneThroughFiveYears This item represents the average yield on debt securities with maturities expected to mature after one through five years from the balance sheet date and which are categorized as held-to-maturity. Due after five years through ten years, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldAfterFiveThroughTenYears This item represents the average yield on debt securities with maturities after five through ten years as of the balance sheet date and which are categorized as held-to-maturity. Due after ten years, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldAfterTenYears This item represents the average yield on debt securities with maturities due after ten years as of the balance sheet date and which are categorized as held-to-maturity. Weighted average yield HeldToMaturitySecuritiesDebtMaturitiesAverageYield This item represents average yield on the total of all debt securities grouped by maturity dates, at fair value, which are categorized as held-to-maturity. Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restricted shares outstanding at December 31, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Cancelled or forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Restricted shares outstanding at December 31, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding, Weighted Average Grant Date Fair Value, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Cancelled or forfeited, Weighted Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Outstanding, Weighted Average Grant Date Fair Value, Outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of stock options outstanding, beginning balance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of options exercised (shares) Number of stock options outstanding, ending balance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted Average Exercise Price, exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted average remaining term, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted Average Remaining Contractual Term, exercised Share-Based Compensation Arrangements By Share-Based Payment Award, Options Exercises In Period, Weighted Average Remaining Contractual Term Weighted average remaining contractual term of options at the time when holders converted their stock options into shares. Weighted average remaining term, ending balance Aggregate Intrinsic Value, beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate Intrinsic Value, ending balance Number of stock options that are exercisable and expected to be exercisable (shares) Share Based Compensation Arrangement By Share Based Payment,Exercisable and Expected to be Exercisable Share based compensation arrangement by share based payment award options exercisable and expected to be exercisable number. Number of Options exercisable (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price, options exercisable or expected to be exercisable (in dollars per share) hmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableAndExpectedToBeExercisableWeightedAverageExercisePrice Share based compensation arrangement by share based payment award options exercisable and expected to be exercisable weighted average exercise price. Weighted Average Exercise Price, options exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted average remaining contractual term, options exercisable and expected to be exercisable Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable And Expected To Be Exercisable, Weighted Average Remaining Contractual Term Share based compensation arrangement by share based payment award options exercisable and expected to be exercisable weighted average remaining contractual term. Weighted average remaining contractual term, options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value of options that are exercisable and expected to be exercisable hmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableAndExpectedToBeExercisableIntrinsicValueOne Share based compensation arrangement by share based payment award options exercisable and expected to be exercisable intrinsic value one. Aggregate Intrinsic Value of options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Premises and Equipment Property, Plant and Equipment [Table Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Deposit balances, including stated rates Deposits, by Type [Abstract] Noninterest bearing accounts Noninterest-bearing Deposit Liabilities NOW accounts Deposits, Negotiable Order of Withdrawal (NOW) Statement savings accounts, due on demand Deposits, Savings Deposits Money market accounts, due on demand Deposits, Money Market Deposits Certificates of deposit Time Deposits Deposits, Total Time Deposits [Table] Time Deposits [Table] Time Deposits [Line Items] Time Deposits [Line Items] Weighted Average Rate, NOW accounts Weighted Average Rate Domestic Deposit, Notice of Withdrawal Weighted Average Rate, Statement savings accounts Weighted Average Rate Domestic Deposit, Savings Weighted Average Rate, Money market accounts Weighted Average Rate Domestic Deposit, Money Market Weighted Average Rate, Certificates of deposit Weighted Average Rate Domestic Deposit, Certificates of Deposit Maintenance (reimbursements) costs Cost of Property Repairs and Maintenance Loss provisions Real Estate Owned, Valuation Allowance, Provision, Net of Portion Attributable to FHA Real Estate Owned, Valuation Allowance, Provision, Net of Portion Attributable to FHA Net gain on sales Gains (Losses) on Sales of Other Real Estate Net operating income (loss) Real Estate Revenue, Net Net cost (income) from operations and sale of other real estate owned Interest-bearing instruments Interest-bearing Deposits in Banks and Other Financial Institutions Investment securities held at fair value (AFS) Investments, Fair Value Disclosure Single family loans held for sale